US1836882A - Electrical machine - Google Patents

Electrical machine Download PDF

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Publication number
US1836882A
US1836882A US383600A US38360029A US1836882A US 1836882 A US1836882 A US 1836882A US 383600 A US383600 A US 383600A US 38360029 A US38360029 A US 38360029A US 1836882 A US1836882 A US 1836882A
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United States
Prior art keywords
machine
slots
winding
high frequency
parts
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Expired - Lifetime
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US383600A
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English (en)
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Nilsson-Stig Torsten
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Individual
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Individual
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Publication date
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Publication of US1836882A publication Critical patent/US1836882A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/47—Air-gap windings, i.e. iron-free windings

Definitions

  • the present invention has for its Object to provide electrical machines, generators, motors or converters with appreciably reduced iron losses, whereby the efficiency may in cer- 8 tain cases be improved upon.
  • the characteristic feature of the invention resides in that the armature windings are inserted into a special former or frame of elec trically and magnetically insulating mate- !0 rial, such as synthetic resins as akelite, pressboard, presswood, paper, mica prepared or treated with synthetic resins, steatite and materials with equal properties of the proper mechanical strength, said former, or
  • Figs. l to 3 show by way of example and diagrammatically parts of an electric machine according to different forms of embodiment.
  • Fig. 4 1s an end view of a machine having a winding varrangement according to the embodiment shown in Fig. 3.
  • a and B here designate the magnetically vactive parts of the machine.
  • C is-'a former or frame of insulating solid material, and D and E are the armature windings.
  • this machine construction is particularly advantageous in machines for rather high alternating current frequencies.
  • The'armature conductors of the high frequency windings may be so disposed in their frame orformer as to bebrought nearer to that part of the machine which is in movement relatively to the said winding' during operation, and at any rate, in regard to the A strength of the material of the frame, as'near as possible 'to said part ofthe machine.
  • the space between the iron masses of the stator and the rotor of the machine should be made so larve that the high frequency pulsations in t e magnetic field are equalized as far as possible/when the magnetic field has moved over the intervening space or the air-gap. It is also of importance that that part of the machine, which during operation is not in motion relatively to the armature winding, while being magnetically operative, has no slots adjacent to the air-gap or the intermediate space between the rotor and the stator, in order that the high frequent magnetic changes of density in the iron may become as smal as possible.
  • Figs. 2 and 3 of the drawings show how the high frequency winding D is disposed in its frame C connected to the stator A, in such a manner however that the winding is brought nearer to the rotor B provided with slots and teeth.
  • the width of the air-gap is also disclosed, and itl will be seen that the stator has noslots.
  • High frequency machines may also be made of another type where the main magnetic field is made with pronounced poles, as shown in Fig. 3, the external portions of the main poles being provided with slots and teeeth so adapted that the high frequency pulsa-tions in the magnetic field all around the circumference co-operate toward genion erating a high frequency E. M. F. in the armature winding D.
  • This is effected in such manner that the slots of the magnet winding M at the external portions of the rotor B are given a Width corresponding to an even number of slots and teeth, as shown in Fig. 3 by ldotted lines In this way, the teeth under north pole magnetization are caused to cooperate with the slots under south pole magnetization, and vice Versa.
  • a high frequency machine withl prof nounced poles may also be -provided with an additional armature winding for low i frequency or direct current, intended to drive the machine in co-operation with the main field.
  • This winding which is designated by E in Fig. 3, should also be disposed in a frameV or former of insulating solid material between the magnetically active parts of the machine, or, saidwin'ding may be disposed in the same frame C as the high frequency winding D.
  • electrical machines may also be devised as indicated in Fig. l that is'to say, with the armature windings D in their frame C free from the magnetically active parts A andB, which parts are in this case in motion relatively to the armature windings during operation, the main pole pitch aswell yas the pitch of the slots and teeth having then to be the same in AV and B.
  • the frames or formers intended; to carry the armature windings vfirst be provided with slots for .the conductors and may be assembled as a unit, whereupon the windings are drawn into the slots.
  • Imagnetically insulating material located be-'L tween said magnetically active iron parts
  • a rotary electrical machine adapted for f generating high frequence alternating cur r-ent, comprising magnetically active iron.
  • a rotary .electrical'machine ⁇ according to claim 5, characterized-'by the factrthat there is inserted. in addition tothe winding for generating high frequency alternating current, in thatv part of the machine which carries the said winding, a second winding for generating low frequency alternating current or directcnrrent intended to drivethe machineV in 4cooperation with the main magnetic field.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
US383600A 1928-08-16 1929-08-05 Electrical machine Expired - Lifetime US1836882A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE317444X 1928-08-16
SE679712X 1928-08-16
SE549070X 1928-08-16
SE1836882X 1928-08-16

Publications (1)

Publication Number Publication Date
US1836882A true US1836882A (en) 1931-12-15

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ID=27484574

Family Applications (1)

Application Number Title Priority Date Filing Date
US383600A Expired - Lifetime US1836882A (en) 1928-08-16 1929-08-05 Electrical machine

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US (1) US1836882A (fr)
FR (1) FR679712A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761752A (en) * 1972-05-01 1973-09-25 Int Research & Dev Co Ltd Dynamoelectric machine winding support
US4140933A (en) * 1976-04-10 1979-02-20 Bbc Brown Boveri & Company Limited Arrangement for slipring-free measurement of rotor current of an electrical machine
US4238702A (en) * 1978-11-16 1980-12-09 Belova Tamara N Bar winding of stator of slotless-core electrical machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761752A (en) * 1972-05-01 1973-09-25 Int Research & Dev Co Ltd Dynamoelectric machine winding support
US4140933A (en) * 1976-04-10 1979-02-20 Bbc Brown Boveri & Company Limited Arrangement for slipring-free measurement of rotor current of an electrical machine
US4238702A (en) * 1978-11-16 1980-12-09 Belova Tamara N Bar winding of stator of slotless-core electrical machine

Also Published As

Publication number Publication date
FR679712A (fr) 1930-04-16

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